999999403 has 8 divisors (see below), whose sum is σ = 1077820128. Its totient is φ = 922306944.

The previous prime is 999999391. The next prime is 999999433. The reversal of 999999403 is 304999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-999999403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999999433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15550 + ... + 47347.

It is an arithmetic number, because the mean of its divisors is an integer number (134727516).

Almost surely, 2^999999403 is an apocalyptic number.

999999403 is a deficient number, since it is larger than the sum of its proper divisors (77820725).

999999403 is a wasteful number, since it uses less digits than its factorization.

999999403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64133.

The product of its (nonzero) digits is 6377292, while the sum is 61.

The square root of 999999403 is about 31622.7671622836. The cubic root of 999999403 is about 999.9998010000. Note that the first 3 decimals are identical.

The spelling of 999999403 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred three".